Hello,
I am wondering why the RIR of clay minerals such as vermiculite and
montmorillonite is so high in the structural files (e.g. around 22-28). I am
not a crystallographer, but I have noticed that high RIRs are usually
associated with dense structures and heavy elements and neither is the ca
The Rietveld-QPA doesn’t require RIR, as the peak intensities of phases are
calculated from the structure models. What do you mean under “doing Rietveld”
and ”structural files” in your case?
***
Leonid A. Solovyov
Institute of Chemistry and C
Dear Maria,
indeed the relative intensities of the first basal reflection (you
expressed this as RIR) of smectites/vermiculites are quite high. There
are several reasons:
1) because of high d spacings / low diffraction angle peaks always cause
high L and P factors
2) because the layered structu
I'm not familiar with Jade, and from your description I may only speculate that
such difference in calculated RIRs for the same structure may be caused by
erroneous interpretation of the structure input files by the program (space
group, site occupancies, etc.) or typos in the input.
Dear Leonid,
sorry to come back to an old thread, but there is something to be know
that you didn't tell completely.
So finally I came across this morning to a picture of the fit by ddm of
this bbm48bis sample with planar defects (coming from Maud examples,
picture and example now also on the ddm
Dear Luca,
I'm glad to see your interest to the problem even after such a delay.
>So in the end, your model for faulting as you describe:
>"A more general model [J Appl Cryst (2000) 338] is included in DDM:" was to
>use a trigonal
>cell with hexagonal axis to allow refining the anisotropic shif
